<?php
/**
 * Created by PhpStorm.
 * User: lcz
 * Date: 2018/2/28
 * Time: 15:41
 */
namespace app\common\controller;

use think\Controller;
use think\Request;

class Wxpay extends Controller
{
	
	const APPID = 'wx06a1f489a5831340';
	const MCHID = '1496376012';
	const PARKEY = '568e10999a791ee744d798db108aac44';
	
	public function __construct(Request $request = null)
	{
		parent::__construct($request);
		
	}
	
	/**
	 * //统一下单
	 * @param string $no 订单号
	 * @param string $amount 金额
	 * @param string $notifyUrl 异步地址
	 * @param string $spbill_create_ip 客户端IP
	 * @return array|bool
	 */
	public function create($no, $amount, $notifyUrl, $spbill_create_ip){
		$url = 'https://api.mch.weixin.qq.com/pay/unifiedorder';
		$data = [
			'appid' => self::APPID, //小程序ID 微信分配的小程序ID
			'mch_id' => self::MCHID, //商户号 微信支付分配的商户号
//			'device_info' => '', //设备号(非必填)
			'nonce_str' => $this->createNoncestr(), //随机字符串 随机字符串，不长于32位
//			'sign_type' => '', //签名类型(非必填)
			'body' => '订单支付', //商品描述
//			'detail' => '', //商品详情(非必填)
			'attach' => 'recharge', //附加数据(非必填)
			'out_trade_no' => $no, //商户订单号
//			'fee_type' => '', //货币类型(非必填)
			'total_fee' => $amount*100, //总金额
			'spbill_create_ip' => $spbill_create_ip, //终端IP
//			'time_start' => '', //交易起始时间(非必填)
//			'time_expire' => '', //交易结束时间(非必填)
//			'goods_tag' => '', //商品标记(非必填)
			'notify_url' => $notifyUrl, //通知地址
			'trade_type' => 'APP', //交易类型
//			'limit_pay' => '', //指定支付方式(非必填) 'openid' => $user['openid'], //用户标识
		];
		
		
		$data['sign'] = $this->getSign($data);
		$xmlData = $this->arrayToXml($data);
		$res = $this->xmlToArray($this->postXmlCurl($xmlData, $url, 60));
		if($res['return_code'] == 'SUCCESS') {
			$resData = [
				'appId' => self::APPID,
				'timeStamp' => (string) time(),
				'nonceStr' => (string) time(),
                'package' =>  'prepay_id='.$res['prepay_id'],
				'prepay_id' => $res['prepay_id'],
                'signType' => 'MD5',
			];
			
			$resData['paySign'] = $this->getSign($resData);
			
			return $resData;
		} else {
			return false;
		}
	}


	private static function postXmlCurl($xml, $url, $second = 30)
	{
		$ch = curl_init();
		//设置超时
		curl_setopt($ch, CURLOPT_TIMEOUT, $second);
		curl_setopt($ch, CURLOPT_URL, $url);
		curl_setopt($ch, CURLOPT_SSL_VERIFYPEER, FALSE);
		curl_setopt($ch, CURLOPT_SSL_VERIFYHOST, FALSE); //严格校验
		//设置header
		curl_setopt($ch, CURLOPT_HEADER, FALSE);
		//要求结果为字符串且输出到屏幕上
		curl_setopt($ch, CURLOPT_RETURNTRANSFER, TRUE);
		//post提交方式
		curl_setopt($ch, CURLOPT_POST, TRUE);
		curl_setopt($ch, CURLOPT_POSTFIELDS, $xml);
		
		
		curl_setopt($ch, CURLOPT_CONNECTTIMEOUT, 20);
		curl_setopt($ch, CURLOPT_TIMEOUT, 40);
		set_time_limit(0);
		
		
		//运行curl
		$data = curl_exec($ch);
		//返回结果
		if ($data) {
			curl_close($ch);
			return $data;
		} else {
			$error = curl_errno($ch);
			curl_close($ch);
			throw new WxPayException("curl出错，错误码:$error");
		}
	}
	
	
	
	//数组转换成xml
	private function arrayToXml($arr) {
		$xml = "<root>";
		foreach ($arr as $key => $val) {
			if (is_array($val)) {
				$xml .= "<" . $key . ">" . arrayToXml($val) . "</" . $key . ">";
			} else {
				$xml .= "<" . $key . ">" . $val . "</" . $key . ">";
			}
		}
		$xml .= "</root>";
		return $xml;
	}
	
	
	//xml转换成数组
	private function xmlToArray($xml) {
		
		
		//禁止引用外部xml实体
		
		
		libxml_disable_entity_loader(true);
		
		
		$xmlstring = simplexml_load_string($xml, 'SimpleXMLElement', LIBXML_NOCDATA);
		
		
		$val = json_decode(json_encode($xmlstring), true);
		
		
		return $val;
	}
	
	//作用：产生随机字符串，不长于32位
	private function createNoncestr($length = 32) {
		$chars = "abcdefghijklmnopqrstuvwxyz0123456789";
		$str = "";
		for ($i = 0; $i < $length; $i++) {
			$str .= substr($chars, mt_rand(0, strlen($chars) - 1), 1);
		}
		return $str;
	}
	
	
	//作用：生成签名
	public function getSign($Obj) {
		foreach ($Obj as $k => $v) {
			if($v) {
				$Parameters[$k] = $v;
			}
		}
		//签名步骤一：按字典序排序参数
		ksort($Parameters);
		$String = $this->formatBizQueryParaMap($Parameters, false);
		//签名步骤二：在string后加入KEY
		$String = $String . "&key=" . self::PARKEY;
		//签名步骤三：MD5加密
		$String = md5($String);
		//签名步骤四：所有字符转为大写
		$result_ = strtoupper($String);
		return $result_;
	}
	
	
	///作用：格式化参数，签名过程需要使用
	private function formatBizQueryParaMap($paraMap, $urlencode) {
		$buff = "";
		ksort($paraMap);
		foreach ($paraMap as $k => $v) {
			if ($urlencode) {
				$v = urlencode($v);
			}
			$buff .= $k . "=" . $v . "&";
		}
		$reqPar = '';
		if (strlen($buff) > 0) {
			$reqPar = substr($buff, 0, strlen($buff) - 1);
		}
		return $reqPar;
	}
	

}